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  • Crash at sws_scale when converting AVFrame to RGB32

    1er mars 2017, par WLGfx

    Crashing at sws_scale when converting an AVPicture

    At first I was using sws_scale to actually scale the frames up but the cpu overhead was too high, so I decided to just convert the frames and adjust the QImage size instead. Before it was working and I was getting the video displaying when rendered, but now it crashes at sws_scale.

    This is written in Qt for Android and using FFMpeg 3.1.4.

    Also, is there another way around not using the deprecated functions ?

    Does anybody know why I am getting the crash at sws_scale ?

    The class for the VideoFrameCopy

    class VideoFrameCopy {
    
public:
    
    VideoFrameCopy() {}
    
    VideoFrameCopy(AVFrame *frame) { copyAVFrame(frame); }
    
    ~VideoFrameCopy();
    
    void copyAVFrame(AVFrame *frame); // copy essential data from AVFrame
    

    
    AVPicture picture;
    

    
    int64_t pkt_pts = -1; // show it hasn't been initialised
    
    int64_t best_pts;
    
    int interlaced_frame;
    
    int width = 0, height = 0;
    
    int format = -1;
    
};

    The code that converts the frame to RGBA8888 QImage

    if (frame) {
    

    
    if (image->width() != vid_ctx->width || image->height() != vid_ctx->height) {
    
        QSize old_size(image->size());
    

    
        // block until renderer has finished with it
    

    
        while (parent->buffer_ready) {
    
            QThread::yieldCurrentThread();
    
        }
    

    
        delete image;
    

    
        image = new QImage(vid_ctx->width, vid_ctx->height, QImage::Format_RGBA8888);
    
        parent->image = image;
    

    
        if (scale_context) sws_freeContext(scale_context);
    
        scale_context = nullptr;
    

    
        qDebug() << "Video image size" << image->size() << "old" << old_size;
    
    }
    

    
    // the src width and height may need to change to use the context info instead
    

    
    if (!scale_context) { // create the scale context
    
        int src_width = vid_ctx->width;
    
        int src_height = vid_ctx->height;
    
        AVPixelFormat src_format = vid_ctx->pix_fmt;//(AVPixelFormat)frame->format;
    

    
        int dst_width = vid_ctx->width;
    
        int dst_height = vid_ctx->height;
    
        AVPixelFormat dst_format = AV_PIX_FMT_RGBA;
    

    
        scale_context = sws_getContext(src_width, src_height, src_format,
    
                                       dst_width, dst_height, dst_format,
    
                                       SWS_FAST_BILINEAR, NULL, NULL, NULL);
    

    
        av_image_fill_linesizes(scale_linesizes, dst_format, vid_ctx->width);
    

    
        qDebug() << "Created scale context" << scale_context;
    
    }
    

    
    if (scale_context) { // valid
    
        scale_data[0] = image->bits();
    

    
        sws_scale(scale_context,
    
                  frame->picture.data, // deprecated
    
                  frame->picture.linesize, // deprecated
    
                  0, image->height(),
    
                  scale_data,
    
                  scale_linesizes);
    

    
        qDebug() << "Frame converted";
    
    }
    

    
    //av_frame_unref(frame);
    

    
    //vid_frames_mutex.lock();
    
    //if (quit) av_frame_free(&frame);
    
    if (quit) delete frame;
    
    else vid_frames_unused.push_back(frame);
    
    //vid_frames_mutex.unlock();
    

    
    //qDebug() << "got frame" << clock_current_frame_last << "clock" << clock_current_time;
    
}
    

    
vid_frames_mutex.unlock();
    

    
return frame != nullptr;

    Functions from the VideoFrameCopy class

    void VideoFrameCopy::copyAVFrame(AVFrame *frame) {
    
    if (pkt_pts != -1 &&
    
            (width != frame->width ||
    
             height != frame->height ||
    
             format != frame->format)
    
            ) { // picture changed?
    
        avpicture_free(&picture); // deprecated
    
        pkt_pts = -1;
    
    }
    

    
    width = frame->width;
    
    height = frame->height;
    
    format = frame->format;
    
    interlaced_frame = frame->interlaced_frame;
    

    
    if (pkt_pts == -1) { // alloc picture
    
        if (avpicture_alloc(&picture, (AVPixelFormat)format, width, height) < 0) return; // deprecated
    
        int size = avpicture_get_size((AVPixelFormat)format, width, height); // deprecated
    
        uint8_t *picture_data = (uint8_t*)av_malloc(size);
    
        avpicture_fill(&picture, picture_data, (AVPixelFormat)format, width, height); // deprecated
    

    
        qDebug() << "New frame" << width << "x" << height << format;
    
    }
    

    
    pkt_pts = frame->pkt_pts;
    
    best_pts = av_frame_get_best_effort_timestamp(frame);
    

    
    av_picture_copy(&picture, (AVPicture*)frame, (AVPixelFormat)format, width, height); // deprecated
    

    
    qDebug() << "picture" << picture.linesize[0] << picture.linesize[1]; // deprecated
    
}
    

    
VideoFrameCopy::~VideoFrameCopy() {
    
    if (pkt_pts != -1) {
    
        /*if (picture.data) {
    
            av_free(picture.data);
    
            picture.data = nullptr;
    
        }*/
    
        avpicture_free(&picture); // deprecated
    
    }
    
}

    Sample output from the logcat

    D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:659 (void VideoFrameCopy::copyAVFrame(AVFrame*)): New frame 640 x 358 0
    
D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:667 (void VideoFrameCopy::copyAVFrame(AVFrame*)): picture 640 320
    
D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:586 (bool FFMpegFile::getVideoFrame()): Video image size QSize(640, 358) old QSize(500, 320)
    
D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:659 (void VideoFrameCopy::copyAVFrame(AVFrame*)): New frame 640 x 358 0
    
D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:606 (bool FFMpegFile::getVideoFrame()): Created scale context 0x4bb49060
    
D/libcwengage2.so(20157): ../cwengage2/ffmpegfile.cpp:667 (void VideoFrameCopy::copyAVFrame(AVFrame*)): picture 640 320
    
F/libc    (20157): Fatal signal 7 (SIGBUS) at 0x4e065008 (code=1), thread 20335 (QThread)
    
I/DEBUG   (  116): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    
I/DEBUG   (  116): Build fingerprint: 'ODROID/odroidc/odroidc:4.4.2/KOT49H/odroidc-eng-s805_4.4.2_master-410:eng/test-keys'
    
I/DEBUG   (  116): Revision: '10'
    
I/DEBUG   (  116): pid: 20157, tid: 20335, name: QThread  >>> org.qtproject.example <<<
    
I/DEBUG   (  116): signal 7 (SIGBUS), code 1 (BUS_ADRALN), fault addr 4e065008
    
I/DEBUG   (  116):     r0 00000280  r1 00000166  r2 4e065008  r3 00000a00
    
I/DEBUG   (  116):     r4 4d9bd030  r5 00000280  r6 4d9f4f28  r7 00000140
    
I/DEBUG   (  116):     r8 00000280  r9 00000010  sl 4da02ee8  fp 4e065a08
    
I/DEBUG   (  116):     ip 4d9bd2a0  sp 4c1948f8  lr 4a8f1d2c  pc 4a8f4dc0  cpsr 280f0010
    
I/DEBUG   (  116):     d0  004a004a004a004a  d1  0081ffccffe70066
    
I/DEBUG   (  116):     d2  004a004a004a004a  d3  0000000000000000
    
I/DEBUG   (  116):     d4  0000000000000000  d5  0000000000000000
    
I/DEBUG   (  116):     d6  0000000001010101  d7  0000000001010101
    
I/DEBUG   (  116):     d8  0000000001010101  d9  ffffffffffffffff
    
I/DEBUG   (  116):     d10 0000000000000000  d11 0000000000000000
    
I/DEBUG   (  116):     d12 0000000000000000  d13 ffffffffffffffff
    
I/DEBUG   (  116):     d14 004a004a004a004a  d15 004a004a004a004a
    
I/DEBUG   (  116):     d16 0000000000000000  d17 0000000000000000
    
I/DEBUG   (  116):     d18 0000000000000000  d19 0000000000000000
    
I/DEBUG   (  116):     d20 0000000000000000  d21 0000000000000000
    
I/DEBUG   (  116):     d22 0000000000000000  d23 0000000000000000
    
I/DEBUG   (  116):     d24 0000000000000000  d25 0000000000000000
    
I/DEBUG   (  116):     d26 0000000000000000  d27 0000000000000000
    
I/DEBUG   (  116):     d28 004a004a004a004a  d29 0000000000000000
    
I/DEBUG   (  116):     d30 0000000000000000  d31 0000000000000000
    
I/DEBUG   (  116):     scr 20000010
    
I/DEBUG   (  116): 
    
I/DEBUG   (  116): backtrace:
    
I/DEBUG   (  116):     #00  pc 0000edc0  /data/app-lib/org.qtproject.example-1/libswscale-4.so
    
I/DEBUG   (  116):     #01  pc 0000bd28  /data/app-lib/org.qtproject.example-1/libswscale-4.so
    
I/DEBUG   (  116): 
    
I/DEBUG   (  116): stack:
    
I/DEBUG   (  116):          4c1948b8  0000004b  
    
I/DEBUG   (  116):          4c1948bc  4bb2d270  
    
I/DEBUG   (  116):          4c1948c0  0000013c  
    
I/DEBUG   (  116):          4c1948c4  4011edbc  /system/lib/libc.so (dlmalloc+480)
    
I/DEBUG   (  116):          4c1948c8  4c19494a  [stack:20335]
    
I/DEBUG   (  116):          4c1948cc  4015e384  
    
I/DEBUG   (  116):          4c1948d0  00000010  
    
I/DEBUG   (  116):          4c1948d4  489033ef  /data/app-lib/org.qtproject.example-1/libQt5Core.so
    
I/DEBUG   (  116):          4c1948d8  00001000  
    
I/DEBUG   (  116):          4c1948dc  00000000  
    
I/DEBUG   (  116):          4c1948e0  4bb2d470  
    
I/DEBUG   (  116):          4c1948e4  4bb2d478  
    
I/DEBUG   (  116):          4c1948e8  4bb2d478  
    
I/DEBUG   (  116):          4c1948ec  4bb2d470  
    
I/DEBUG   (  116):          4c1948f0  00000002  
    
I/DEBUG   (  116):          4c1948f4  4012109c  /system/lib/libc.so (dlfree+996)
    
I/DEBUG   (  116):     #00  4c1948f8  11111111  
    
I/DEBUG   (  116):          ........  ........
    
I/DEBUG   (  116):     #01  4c1948f8  11111111  
    
I/DEBUG   (  116):          4c1948fc  3fa11111  
    
I/DEBUG   (  116):          4c194900  40000000  
    
I/DEBUG   (  116):          4c194904  40640d79  /system/lib/libskia.so
    
I/DEBUG   (  116):          4c194908  00000000  
    
I/DEBUG   (  116):          4c19490c  3ff00000  
    
I/DEBUG   (  116):          4c194910  00000000  
    
I/DEBUG   (  116):          4c194914  3ff00000  
    
I/DEBUG   (  116):          4c194918  00000000  
    
I/DEBUG   (  116):          4c19491c  3ff00000  
    
I/DEBUG   (  116):          4c194920  00000000  
    
I/DEBUG   (  116):          4c194924  3f800000  
    
I/DEBUG   (  116):          4c194928  00000000  
    
I/DEBUG   (  116):          4c19492c  00000000  
    
I/DEBUG   (  116):          4c194930  00000000  
    
I/DEBUG   (  116):          4c194934  00000000  
    
I/DEBUG   (  116): 
    
I/DEBUG   (  116): memory near r2:
    
I/DEBUG   (  116):     4e064fe8 00000000 00000000 00000000 00000007  
    

    
...
    

    
I/DEBUG   (  116): memory map around fault addr 4e065008:
    
I/DEBUG   (  116):     4dd15000-4df15000 rw- /dev/mali
    
I/DEBUG   (  116):     4df15000-4e199000 rw- 
    
I/DEBUG   (  116):     4e676000-4e876000 rw- /dev/mali
    
I/BootReceiver(  479): Copying /data/tombstones/tombstone_07 to DropBox (SYSTEM_TOMBSTONE)
    
W/ActivityManager(  479):   Force finishing activity org.qtproject.example/org.qtproject.qt5.android.bindings.QtActivity
    
I/WindowState(  479): WIN DEATH: Window{64cf3a40 u0 org.qtproject.example/org.qtproject.qt5.android.bindings.QtActivity}
    
I/WindowState(  479): WIN DEATH: Window{64d0f6e0 u0 SurfaceView}
    
I/UsageStats(  479): No package stats for pkg:org.qtproject.example
    
I/art     (  118): Process 20157 terminated by signal (7)
    
W/ActivityManager(  479): Exception thrown during pause
    
W/ActivityManager(  479): android.os.DeadObjectException
    
W/ActivityManager(  479):   at android.os.BinderProxy.transact(Native Method)
    
W/ActivityManager(  479):   at android.app.ApplicationThreadProxy.schedulePauseActivity(ApplicationThreadNative.java:660)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityStack.startPausingLocked(ActivityStack.java:778)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:2614)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityStack.finishTopRunningActivityLocked(ActivityStack.java:2488)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityStackSupervisor.finishTopRunningActivityLocked(ActivityStackSupervisor.java:2196)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityManagerService.handleAppCrashLocked(ActivityManagerService.java:9705)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityManagerService.makeAppCrashingLocked(ActivityManagerService.java:9598)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityManagerService.crashApplication(ActivityManagerService.java:10243)
    
W/ActivityManager(  479):   at com.android.server.am.ActivityManagerService.handleApplicationCrashInner(ActivityManagerService.java:9794)
    
W/ActivityManager(  479):   at com.android.server.am.NativeCrashListener$NativeCrashReporter.run(NativeCrashListener.java:86)
    
D/ActivityManager(  479): resumeClassName is com.android.launcher2.Launcher
    
D/ActivityManager(  479): resumePackageName is com.android.launcher
    
I/ActivityManager(  479): Process org.qtproject.example (pid 20157) has died.
    
D/ActivityManager(  479): send app_CRASH broadcast, packageName:org.qtproject.example

    Much appreciated if anyone can help...

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